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4b2t

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The crystal structures of the eukaryotic chaperonin CCT reveal its functional partitioning

Structural highlights

4b2t is a 16 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 5.5Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TCPA_BOVIN Molecular chaperone; assists the folding of proteins upon ATP hydrolysis. As part of the BBS/CCT complex may play a role in the assembly of BBSome, a complex involved in ciliogenesis regulating transports vesicles to the cilia. Known to play a role, in vitro, in the folding of actin and tubulin (By similarity).

Publication Abstract from PubMed

In eukaryotes, CCT is essential for the correct and efficient folding of many cytosolic proteins, most notably actin and tubulin. Structural studies of CCT have been hindered by the failure of standard crystallographic analysis to resolve its eight different subunit types at low resolutions. Here, we exhaustively assess the R value fit of all possible CCT models to available crystallographic data of the closed and open forms with resolutions of 3.8 A and 5.5 A, respectively. This unbiased analysis finds the native subunit arrangements with overwhelming significance. The resulting structures provide independent crystallographic proof of the subunit arrangement of CCT and map major asymmetrical features of the particle onto specific subunits. The actin and tubulin substrates both bind around subunit CCT6, which shows other structural anomalies. CCT is thus clearly partitioned, both functionally and evolutionary, into a substrate-binding side that is opposite to the ATP-hydrolyzing side.

The Crystal Structures of the Eukaryotic Chaperonin CCT Reveal Its Functional Partitioning.,Kalisman N, Schroder GF, Levitt M Structure. 2013 Mar 5. pii: S0969-2126(13)00039-7. doi:, 10.1016/j.str.2013.01.017. PMID:23478063^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Kalisman N, Schröder GF, Levitt M. The crystal structures of the eukaryotic chaperonin CCT reveal its functional partitioning. Structure. 2013 Apr 2;21(4):540-9. PMID:23478063 doi:10.1016/j.str.2013.01.017